The usual heparin sodium concentration for anticoagulation during hemodialysis is:

The usual concentration of heparin sodium for anticoagulation during hemodialysis is typically 1,000 units per milliliter (u/ml). This concentration is commonly used because it provides effective anticoagulation to prevent clotting in the dialysis circuit without significantly increasing the risk of bleeding.

Using a concentration of 1,000 u/ml allows for controlled administration and easy calculations for dosing during treatments. Higher concentrations, such as 5,000 u/ml or more, might pose a greater risk for complications such as excessive bleeding or heparin-induced thrombocytopenia. Thus, the lower concentration of 1,000 u/ml is generally preferred as it balances effective treatment with patient safety during the hemodialysis process.